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Organosulfates forms differently in Pearl River Delta TEXT SIZE: A A A

 

Pinene and isoprene, both important biogenic secondary oragnic aerosol (BSOA) precursors, form organosulfates (OSs) after reacting with anthropogenic pollutants (eg. NOx and SO2). This processe produces large amouts of BSOA and aggravates fine particle pollution, especially in regions with high anthropogenic emissions like the Pearl River Delta (PRD).

 

Scientists from the State Key Laboratory of Organic Geochemistry analyzed the OSs from pinene and isoprene in the PRD, one of the most developed regions with severe air pollution in China. They found that pinene-derived nitrooxy-organosulfates (pNOSs, MW=295) mainly produced through photooxidation in daytime but negligible through NO3 chemistry in nightime, although the latter was thought to be important to produce pNOSs in nightime. Moreover, due to the extremely low particle acidity (eg. pH = -2 at noon), alcohol sulfate eserification that was thought to be kenitically infeasible in the real atmosphere is a possible formation pathway of OSs in the air of the PRD. The isoprene-derived organosulfate (iOS, MW=216) showed much low concentrations, largely due to the depression of isoprene-derived epoxydiols (IEPOX) formation by the high NOx levels over the PRD.

 

In a word, the formation of Organosulfates in the heavily polluted PRD proves to be quite different from things in other places, providing insights into the unique mechanisms of OSs formation in heavily polluted regions.These results have been published in the last issued Environmental Science & Technology (2014, 48, 9236-9245).

 

         Image by HE Quanfu, GIGCAS

 

                                (Supplied by the State Key Laboratory of Organic Geochemistry & General Office, CASGIG)
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